This library covers practical technical topics around LV, 11kV and 33kV cable jointing, terminations, substations, testing and fault response. The articles are written from a contractor's perspective — focused on what actually matters on site. If you need a contractor for delivery work, see our service pages.
Technical Articles
- 11kV Cable Jointing Methods: What Actually Matters on Site — Joint types, preparation standards and the site factors that create failures.
- 33kV Terminations: Common Failure Points and How to Avoid Them — Where termination failures start and what good looks like on a 33kV job.
- HV Cable Testing: VLF vs DC and What Each Test Tells You — Practical differences between VLF and DC testing, and how testing fits into a clean energisation handover.
- Cable Fault Location Methods: A Practical Overview for Project Teams — Common fault types, location approaches and how to plan the repair once the fault is found.
- ICPs, DNOs & IDNOs Explained — What each organisation does, how they interact on a new development connection, and where R&D Cable Jointing fits in the supply chain.
- Contestable vs Non-Contestable Works — What you can tender competitively, what the DNO controls, and why it matters for your budget and programme.
- Solar, BESS & Wind: HV Jointing & Fault Finding — The specific HV jointing and fault finding requirements of solar farms, battery storage and onshore wind installations.
Our Services
The technical guides link to our service pages where relevant. If you have an upcoming project, the relevant service pages contain full scope information and contact details.
- HV Cable Jointing — 11kV and 33kV cable jointing, repairs and diversions
- HV Cable Terminations — indoor and outdoor terminations up to 33kV
- HV Substation Services — full substation installation and fit-out
- HV Testing & Commissioning — pre-energisation testing and commissioning support
- HV Fault Response — cable fault repairs following location
- LV Cable Jointing — LV mains, services and terminations
- SAP Services — Senior Authorised Person attendance up to 33kV